CN201293982Y - Simultaneous sensing device, and electronic equipment and mobile telephone applying the simultaneous sensing device - Google Patents
Simultaneous sensing device, and electronic equipment and mobile telephone applying the simultaneous sensing device Download PDFInfo
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- CN201293982Y CN201293982Y CNU2008200062648U CN200820006264U CN201293982Y CN 201293982 Y CN201293982 Y CN 201293982Y CN U2008200062648 U CNU2008200062648 U CN U2008200062648U CN 200820006264 U CN200820006264 U CN 200820006264U CN 201293982 Y CN201293982 Y CN 201293982Y
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/325—Power saving in peripheral device
- G06F1/3262—Power saving in digitizer or tablet
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/325—Power saving in peripheral device
- G06F1/3265—Power saving in display device
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
- G06F3/041661—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/047—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using sets of wires, e.g. crossed wires
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04101—2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
Abstract
The utility model relates to a simultaneous sensing apparatus, an electronic device and a mobile phone, and wherein the simultaneous sensing apparatus is used for the electronic device and the mobile phone. The simultaneous sensing apparatus comprises a touch sensitive surface with a plurality of sensing points, a drive circuit and a sensing circuit, wherein each sensing point is relative to one of pluralities of drive wires and one of pluralities of sensing wires, the drive circuit is arranged to apply a drive signal to two or more of the drive wires, the unique drive signal is applied to each of the two or more of the drive wires, the sensing circuit is arranged to detect a sensing signal of at least one sensing wire, the sensing signal is relative to the drive signal through touching objects or approaching the sensing point relative to the sensing wire, and touch information of one or more sensing points can be obtained from the sensing signal. The utility model can utilize the drive signal with unique characteristic to simultaneously or approximately stimulate the drive wires, and resolves the technical problem that the prior art can not sense simultaneously.
Description
Technical field
The utility model relates to a kind of touch-sensing equipment.
Background technology
Recently, can discern simultaneously a plurality of touches and/or suspension (hover) incident be used for electronic equipment and computer system based on touching and/or approaching input system receives publicity.Many systems in these systems system of mutual capacitance or some light sensing apparatus (for example based on) relate to a plurality of sensing points apply stimulus waveform periodically and by the touch that exists at the sensing points place and/or approaching amount detect may be relevant with the periodicity stimulus waveform sense waveform.In certain embodiments, these systems apply periodically stimulus waveform to the drive wire with the coupling of the sense wire at sensing points place.Usually, stimulus waveform is applied on these drive wires one at a time.Because equipment generally comprises a plurality of this drive wires, so each drive wire is driven successively.
The utility model content
Technical problem to be solved in the utility model is: each drive wire of the prior art is driven successively, thereby can not realize sensing simultaneously.
According to the utility model, a kind of while sensing apparatus is provided, it is characterized in that this while sensing apparatus comprises: have the touch sensitive surface of a plurality of sensing points, in each sensing points and many drive wires and many sense wires is relevant; Driving circuit, it is configured to simultaneously two in described many drive wires or more drive wires apply drive signal, and wherein unique drive signal is applied on each bar in described two or more the drive wires; Sensing circuit, it is configured to: detect the sensing signal at least one sense wire, this sensing signal touches by one or more object or is correlated with drive signal near one or more sensing points relevant with this sense wire; And the touch information that draws described one or more sensing points from this sensing signal.
According to the utility model, a kind of electronic equipment also is provided, this electronic equipment with above-mentioned while sensing apparatus as input equipment.
According to the utility model, a kind of mobile phone also is provided, this mobile phone with above-mentioned while sensing apparatus as input equipment.
According to an embodiment of the present utility model, provide a kind of method that draws touch information from touch sensitive surface.Touch-sensing equipment can comprise a plurality of sensing points.Each sensing points can be positioned at drive wire and sense wire the intersection point place or near.For example, this method can comprise with one or more unique drive signal while (or roughly simultaneously) many drive wires of stimulation.For example, this signal can have predetermined phase place and/or frequency relation.This method also can comprise the sensing signal on sensing at least one sense wire.Sensing signal can touch or near with the intersection point place that is positioned at described many drive wires and described at least one sense wire or near one or more sensing points and relevant with drive signal by one or more object.This method also can for example comprise and draws touch information from sensing signal.Can be by for example drawing a plurality of values and draw touch information from sensing signal according to the mathematical combination of described a plurality of values by on one or more period, sensing signal being quadratured, thus draw touch from sensing signal.
In another embodiment, the utility model can relate to a kind of multiple point touching (multi touch) sensor device.This touch-sensing equipment for example can comprise touch sensitive surface, and this touch sensitive surface has a plurality of sensing points at the intersection point place that is positioned at drive wire and sense wire.This touch-sensing equipment also can comprise the driving circuit that is configured to apply to many drive wires simultaneously unique drive signal.For example, this signal can have predetermined phase place and/or frequency relation.This touch-sensing equipment also can comprise sensing circuit, and this sensing circuit is to be used for detecting the sensing signal of at least one sense wire and to draw touch information at one or more sensing points from this sensing signal by device.This touch-sensing equipment for example can be based on self-capacitance or mutual capacitance.
In another embodiment, the utility model can relate to a kind of electronic equipment or computer system that comprises above-mentioned touch-sensing device or realize above-mentioned touch-sensing method.Electronic equipment can be taked various forms, for example comprises desk-top computer, flat computer, notebook, handheld computer, personal digital assistant, media player or mobile phone.Other form also is possible.
In another embodiment, the utility model can relate to a kind of method that draws touch information from touch sensitive surface.This method can comprise carries out coarse scanning to determine whether having touch in the first area to a zone of touch sensitive surface.If exist to touch, can carry out so this regional close scanning with determine about this region memory the more accurate data of touch.If there is no touch, omit close scanning so, and can begin another regional coarse scanning.By eliminating unnecessary close scanning, can save time and power.
According to the utility model, can be simultaneously or roughly stimulate many drive wires simultaneously with drive signal with unique trait, solved in the prior art technical matters of sensing simultaneously.
Description of drawings
In conjunction with the drawings with reference to the following description, can understand above-mentioned and others of the present utility model best, in the accompanying drawings:
Fig. 1 illustrates the multiple point touching sensor device according to the input equipment that is used as computer system of the embodiment of utility model.
Fig. 2 illustrates according to embodiment of the present utility model and the corresponding a plurality of contact patches zones of object near a plurality of sensing points of multipoint touch surface.
Fig. 3 illustrates the rough schematic view of the mutual capacitance sensing circuit that can be used among the embodiment of the present utility model.
Fig. 4 illustrates the processing that is used to operate according to the multiple point touching sensor device of embodiment of the present utility model.
Fig. 5 illustrates the multiple point touching sensor device according to embodiment of the present utility model.
Fig. 6 illustrates the processing according to the multi-thread stimulation of embodiment of the present utility model.
Fig. 7 illustrates the single line stimulation arrangement according to prior art.
Fig. 8 illustrates the two lines while stimulation arrangement according to embodiment of the present utility model.
Fig. 9 illustrates the four lines while stimulation arrangement according to embodiment of the present utility model.
Figure 10 illustrates can be according to the various electronic equipments of embodiment use of the present utility model and the form of computer system.
Figure 11 illustrates the four lines while stimulation arrangement based on frequency according to embodiment of the present utility model.
Figure 12 illustrates the various replacement schemes according to the stimulation window of embodiment of the present utility model prevailingly.
Embodiment
Can realize with multiple point touching sensing apparatus shown in Figure 1: discern a plurality of whiles or simultaneously touch event roughly.Multiple point touching sensing apparatus 100 can be simultaneously, almost simultaneously, at different time or detect and monitor a plurality of touch attributes (for example comprising sign, position, speed, size, shape and size) on the touch sensitive surface 101 in a certain amount of time.Touch sensitive surface 101 can provide a plurality of sensor points, coordinate or the node 102 that works substantially independently of each other and represent the difference on the touch sensitive surface.Sensing points 102 can be arranged in grid or pel array, makes each sensing points can produce signal simultaneously.Sensing points 102 can be regarded as touch sensitive surface 101 is mapped to the coordinate system of Descartes for example or polar coordinate system.
Touch sensitive surface for example can be taked the form of tablet (tablet) or touch-screen.In order to make touch-screen, can use conducting medium to form capacitance sensing point and other related electric structure such as the substantially transparent of indium tin oxide (ITO).The quantity of sensing points 102 and configuration can change.The quantity of sensing points 102 generally depends on the resolution and the susceptibility of hope.In touch-screen applications, the quantity of sensing points 102 also depends on the hope transparency of touch-screen.
By using multiple point touching sensing apparatus (such as the device that illustrates in greater detail below), the signal that produces at node 102 places of multipoint touch sensor 101 can be used in time produce at the specified point place image that touches.For example, contact with touch sensitive surface 101 or approaching each object (for example, finger, contact pilotage etc.) can produce contact patch zone 201 as shown in Figure 2.In the contact patch zone 201 each can cover several nodes 102.The node 202 that is capped can detect object, and remaining node 102 then can not detect object.As a result, can form the fault image (pixilated image) (its be also referred to as touch image, multiple point touching image or near image) of touch-surface.The signal packets that each can be contacted patch zone 201 together.Each contacts patch zone 201 can be based on the amount of touch at each point place and comprise spikes/low-points.The shape and the spikes/low-points in the image in contact patch zone 201 can be used to distinguish approaching contact patch zone 201 mutually.In addition, current images can be compared with former image, how move in time and should in main equipment, carry out what corresponding action as its result to determine object.
Can use many different detection technologies in combination with these sensing apparatus, comprise the technology of resistive, capacitive character, optics etc. etc.In sensing apparatus,, form little electric capacity at object with between near the sensing points 102 of object when object during near touch sensitive surface 101 based on electric capacity.By capacitance variations that detects each sensing points 102 place that is caused by this little electric capacity and the position of passing through the record sensing points, sensing circuit 103 can detect and monitor multiple point touching.The capacitive sensing node can be based on self-capacitance or mutual capacitance.
In the self-capacitance system, measure " certainly " electric capacity of sensing points with respect to some benchmark of for example earth point.Sensing points 102 can be the electrode that spatially separates.These electrodes are coupled with driving circuit 104 and sensing circuit 103 by conductive trace 105a (drive wire) and 105b (sense wire).In some self-capacitance embodiment, the single conductive trace that arrives each electrode can be used as drive wire and sense wire simultaneously.
In mutual capacitance systems, can measure " mutually " electric capacity between first electrode and second electric capacity.In the mutual capacitance sensing apparatus, the point of crossing of the conductor patterned by forming the line that separates on the space can form sensing points.For example, can make drive wire and sense wire intersect or " intersection " forming drive wire 105a on the ground floor and on the second layer, forming sense wire 105b at sensing points 102 places.Different layers can be the not coplanars of different substrates, same substrate or have the same one side of the substrate of some dielectric separation.Because drive wire and sense wire are separated, therefore locate to exist the capacitive couplings node in each " intersection ".
The mode of arranging drive wire and sense wire can change.For example, in cartesian coordinate system (as shown in the figure), drive wire can form horizontal line, and sense wire can form vertical row (vice versa), forms a plurality of nodes that can be regarded as having visibly different x and y coordinate thus.Scheme as an alternative, in polar coordinate system, sense wire can be a plurality of concentric circless, and drive wire is the line (vice versa) that radially extends, and forms a plurality of nodes that can be regarded as having visibly different r and angle coordinate thus.Under any situation, drive wire 105a can be connected with driving circuit 104, and sense wire 105b can be connected with sensing circuit 103.
In operating process, drive signal (for example, periodic voltage) is applied to each drive wire 105a.When being driven, the electric charge that is applied on the drive wire 105a can pass through node 102 and the sense wire 105b capacitive couplings of intersecting.This can cause detecting in sense wire 105b, measurable electric current and/or voltage.Drive signal and the relation between the signal that occurs on the sense wire 105b are the functions of the electric capacity of couple drive line and sense wire, and this electric capacity can be subjected to influence near the object of node 102 as mentioned above.Capacitance sensing circuit 103 can carry out the electric capacity that sensing also can be determined each node place as explained in further detail below to sense wire 105b.
As mentioned above, conventional drive wire 105a is that each ground is driven, and other drive wire ground connection.105a repeats this process for each drive wire, till having driven all drive wires and having made up the touch image from sensed result (based on electric capacity).In case all line 105a were driven, this sequence can repeat to make up a series of touch images.But, in embodiment more of the present utility model, can be as described below simultaneously or roughly side by side drive a plurality of drive wires as example.As used herein like that, " simultaneously " comprises accurate while and simultaneously incident roughly.For example, simultaneous events can be in the roughly the same time, finishes in the roughly the same time, and/or take place on the partly overlapping at least period.
Fig. 3 illustrates the rough schematic view of the mutual capacitance circuit corresponding with said apparatus 300.Mutual capacitance circuit 300 can comprise spatially separates drive wire 105a and the sense wire 105b that forms capacitive couplings node 102 thus.Drive wire 105a can be coupled with driving circuit 104 electricity (i.e. conduction) by voltage source 301 expressions.Sense wire 105b can with 103 electric coupling of capacitive sensing circuit.Drive wire 105a and sense wire 105b all can comprise some stray capacitances 302 in some cases.
As mentioned above, under the situation near the conductive body of the intersection point of drive wire 105a and sense wire 105b not, the capacitive couplings at node 102 places keeps quite constantly.But, if conductive body (for example, user's finger, contact pilotage etc.) near node 102, capacitive couplings (that is the electric capacity of local system) can change so.Capacitively coupled variation has changed the electric current (and/or voltage) of sense wire 105b carrying.Capacitance sensing circuit 103 can write down the position of capacitance variations and node 102 and report this information with some form to processor 106 (Fig. 1).
With reference to Fig. 1, sensing circuit 103 can obtain data and the data of obtaining are offered processor 106 from touch-surface 101.In certain embodiments, sensing circuit 103 can be configured to send raw data (for example, the array of the capacitance corresponding with each sensing points 102) to processor 106.In other embodiments, sensing circuit 103 can be configured to self handle raw data and send treated touch data to processor 106.Under any situation, processor can use the data of its reception to come control computer system 107 and/or the operation of one or more application of operation thereon then.Various being implemented in the application above-mentioned according to these lines is illustrated, and comprises the various computer systems with touch pad and touch-screen.
In certain embodiments, sensing circuit 103 can comprise one or more microcontroller, and each in these microcontrollers can monitor one or more sensing points 102.Microcontroller can be to work to monitor signal from touch sensitive surface 101, to handle the signal that monitors and to the special IC (ASIC) of processor 106 these information of report with firmware.Microcontroller also can be a digital signal processor (DSP).In certain embodiments, sensing circuit 103 can comprise the electric capacity measured among each sense wire 105b and one or more sensor IC of processor in computer system 107 106 or master controller (not shown) reporting measurements.Can use the sensor IC of any amount.For example, a sensor IC can be used, perhaps a plurality of sensor ICs can be used for single line or one group of line for all lines.
Fig. 4 illustrates the processing 400 that is used to operate such as above-mentioned multiple point touching sensing apparatus on higher level.This processing can be from the piece 401 that drives a plurality of sensing points 102.After piece 401, handle stream and can advance to piece 402, in piece 402, read output from sensing points 102.For example, can obtain the capacitance of each sensing points 102.After piece 402, this processing can advance to piece 403, in piece 403, can produce the image of touch in a certain moment or other form data (signal) and after it is analyzed to determine to touch or near the residing position of the object of touch sensor.After piece 403, this processing can advance to piece 404, in piece 404, the image in current images or signal and one or more past or signal can be compared with one or more the variation in the shape of determining each object, size, position, direction, speed, acceleration, the pressure etc.This information can be used (in step 405) subsequently to carry out the mutual action based on attitude from mobile indicator or cursor to complexity in computer system 107.
As mentioned above, can realize the enhancing operation of multiple point touching sensing apparatus by driving a plurality of row simultaneously.Can be shown among Fig. 5 and have the Reference numeral roughly corresponding its example multiple point touching sensor device 500 that uses multirow to stimulate with sensing apparatus shown in Figure 1 101.In given example, touch sensitive surface 501 has 16 and drives row 505a, but can use the driving row of any amount.Drive row and can be divided into for example four groups, for example, group 1, group 2, group 3 and organize 4, each group comprises four and drives row 505a.Also can use other group number and every group line number.
The scanning of multipoint touch sensor array has been described in various documents, and these documents comprise U.S. Patent application No.11/381313, add it as a reference at this.Can summarize this processing with reference to Fig. 7.Usually, periodic waveform (for example, a series of square-wave pulses) is applied to successively and is driven on the row 505a.For example, first group pulse 701 can be applied on the capable A, and second group pulse 702 afterwards is applied on the capable B, and the 3rd group pulse 703 afterwards is applied on the capable C, and the 4th group pulse 704 afterwards is applied on the capable D.These periodic waveforms capacitively are coupled among the sense wire 505b, and this generally can produce sense waveform 705 on each sense wire.Sense waveform 705 can be in order to the capacitively coupled input in the predetermined periods upper integral between drive wire 505a that measures each node 502 place and the sense wire 505b.Other processing such as filtering, demodulation etc. also can take place.
In sense waveform 705, from t
0To t
1Period with the row A stimulation corresponding.On this period sense waveform quadratured and draw numerical value X1, this numerical value X1 can be corresponding with the electric capacity of the node at the intersection point place of row A and sensed row.Similarly, from t
1To t
2Period with the row B corresponding, from t
2To t
3Period with the row C corresponding, from t
3To t
4Period with the row D corresponding.On in these periods each sense waveform quadratured and can provide numerical value X2, X3 and X4, the electric capacity of the node at the intersection point place of these numerical value X2, X3, X4 and row B, C, D and sensed row is corresponding.
Fig. 8 illustrates the multi-thread stimulation arrangement that can stimulate two lines simultaneously.Specifically, can stimulate row A and go B with waveform 801 and 802 whiles (or roughly simultaneously).As can be seen, for example after the 4th pulse, can adjust the phase place of waveform 801.As a result, waveform 801 and its after pulse of 802 can be 180 ° of out-phase.Similarly, can stimulate row C and go D with waveform 806 and 807 whiles (or roughly simultaneously).Equally, for example after the 4th pulse, can adjust the phase place of waveform 806.As a result, waveform 806 and its after pulse of 807 can be 180 ° of out-phase.With reference to top+and-number can understand the phase relation between these waveforms at an easy rate.
Different with top example with reference to Fig. 7 explanation, t
0To t
1, t
1To t
2, t
2To t
3And t
3To t
4Period no longer uniquely with the row A~D corresponding.Similarly, the electric capacity with the node at the intersection point place of particular row and sensed row is corresponding no longer uniquely for measured value X1, the X2, X3 and the X4 that obtain by on these periods the sense waveform (not shown) being quadratured.In the example of Fig. 8, t
0To t
1And t
1To t
2Period together with they respective measurement values X1 and X2 with the row A and the row B corresponding.Similarly, t
2To t
3And t
3To t
4Period together with they respective measurement values X3 and X4 with the row C and the row D corresponding.But, because therefore the phase differential between the stimulus waveform 801 and 802 only stimulates row A and only stimulates the effect of row B to be separated from each other.Similarly, because therefore the phase differential between the stimulus waveform 806 and 807 only stimulates row C and only stimulates the effect of row D to be separated from each other.
Specifically, since stimulus waveform 801 and 802 at period t
0To t
1Last homophase and at period t
1To t
2Last out-phase, so integral result X1 adds that integral result X2 (being X1+X2) can produce the corresponding value of electric capacity with the node at the intersection point place of row A and sensed line, promptly only produces the effect of the stimulation of row A.Similarly, integral result X1 deducts integral result X2 (being X1-X2) can produce the corresponding value of electric capacity with the node at the intersection point place of row B and sensed line, promptly only produces the effect of the stimulation of row B.
Row C and row D are like this equally.Because stimulus waveform 806 and 807 is at period t
2To t
3Last homophase and at period t
3To t
4Last out-phase, so integral result X3 adds that integral result X4 (being X3+X4) can produce the corresponding value of electric capacity with the node at the intersection point place of row C and sensed line, promptly only produces the effect of the stimulation of row C.Similarly, integral result X3 deducts integral result X4 (being X3-X4) can produce the corresponding value of electric capacity with the node at the intersection point place of row D and sensed line, promptly only produces the effect of the stimulation of row D.
Fig. 9 illustrates the exemplary multi-thread stimulation arrangement that stimulates four lines simultaneously.From t
0To t
1First period in, be applied to periodic waveform 901~904 homophases on capable A~D.At moment t
1, for example after the 4th pulse, waveform 901 and 902 phase place can be adjusted to and make waveform 901 and 902 is 180 ° of out-phase with respect to waveform 903 and 904.Similarly, at moment t
2, for example after four pulses following, waveform 901 and 903 phase place are adjusted.This can cause waveform 901 and 904 is 180 ° of out-phase with respect to waveform 902 and 903.At last, at moment t
3, for example after four pulses again, waveform 901 and 902 phase place can be adjusted once more.This can cause waveform 901 and 903 is 180 ° of out-phase with respect to waveform 902 and 904.Can with reference among the figure+and-number understand the phase relation between each waveform.
As in the previous example above, the phase relation between the waveform 901~904 allows by the mathematical combination that records integral result the effect of the stimulation on each single row to be separated.Specifically, going the effect of stimulation of A can be determined by expression formula X1+X2+X3+X4.The effect of the stimulation of row B can be determined by expression formula X1+X2-X3-X4.The effect of the stimulation of row C can be determined by expression formula X1-X2-X3+X4.The effect of the stimulation of row D can be determined by expression formula X1-X2+X3-X4.
Can further understand the operational processes 600 of multiple point touching sensing apparatus 500 with reference to the process flow diagram of Fig. 6 with multirow stimulation.At first, can obtain the DC content (601) of row group.In the example of Fig. 8, can pass through at period t
0To t
1Go up the DC content that to sense waveform quadrature assigns to obtain comprise this row group of capable A and B.Whether the DC content can (a bit roughly) indication exist any touch in for example capable A corresponding with the specific region of touch-surface 501 and B given group.If in decision block 602, determine in given group/zone, not exist touch, can organize (for example, go C and D) so to next and similarly scan.For example can realize this point (603) by realizing counter.If determining as the DC content of this group indicates, to have touch in given group/zone in the decision block 602, in piece 604, carrying out close scanning so to this group.The result of close scanning can be combined to extract and the corresponding signal of above-mentioned each row.In case all groups all were scanned, then repeat this processing.
Return Fig. 5 and Fig. 6, can scan each row group according to the principle that in above paragraph, illustrates.The multiple point touching sensing apparatus can comprise the row of any amount and the group of any amount.In certain embodiments, the multiple point touching sensing apparatus can use the multi-thread stimulation on single group, that is, and and can the institute of stimulation apparatus be wired simultaneously simultaneously or roughly.In addition, though be illustrated, can arrange drive wire and sense wire to arrange for how much arbitrarily at row and column.
Above-mentioned multi-thread stimulation can provide many advantages.For example, when a plurality of row were stimulated simultaneously, stimulation voltage can reduce.Specifically, the additional effect of multirow stimulation can cause lower " every row " stimulation voltage that identical sense waveform amplitude is arranged.For example, use the one-line scanning configuration of 18Vpp (volt peak-to-peak value) stimulation voltage can use the stimulation voltage of 9Vpp to make two lines be stimulated simultaneously or uses the stimulation voltage of 4.5Vpp to make four lines simultaneously by stimulations etc., to obtain similar sense waveform amplitude.
Reducing stimulation voltage can allow directly to provide drive signal from driver chip under the situation that does not need high-voltage regulator.The voltage that reduces also can help avoid fringing field (fringe field) and transistor breakdown issues.The voltage that reduces also can cause power consumption to reduce.Because power and voltage is square proportional, so make the power of every row divided by the factor 16 divided by the factor 4 (situation about stimulating simultaneously for four lines) voltage.But owing to there are four driven row, therefore actual power-saving may only be the factor 4.But, do not carry out close scanning by detecting when touching when DC scan period to above-mentioned zone, also can save other power.
The modification of above-mentioned multirow stimulating technology can be called as differential multirow to stimulate.Can understand differential multirow with reference to following table and stimulate the comparison of the polarity of the stimulus waveform of the multirow stimulation example (multirow stimulation) of the polarity of the stimulus waveform of this table differential multirow stimulation example of expression (differential multirow stimulation) and above Fig. 9.Except can rearrange the polarity of stimulus waveform as following the indication, differential multirow stimulates with above-mentioned multirow stimulates example corresponding substantially.
From this table as can be seen, stimulate in the example at multirow, the clean polarity that applies on the A that is expert at can have the DC component of the amplitude that is four times in stimulus waveform.Similarly, first period (period of measurable magnitude X1) also can have the clean DC component of the amplitude that is four times in stimulus waveform.Stimulate in the example at differential multirow, polarity can be rearranged to making row and period all not have the DC component.Do not have the DC component can obtain many advantages, comprise allow charge-sensing circuit with zero offset work, automatically baseline remove, intrinsic centroid calculation and the signal to noise ratio (S/N ratio) of raising.In certain embodiments, because the difference of the DC skew between group and the group may be lost because of lack the DC content in stimulation, therefore may wish all row of boost sensor (that is, having only a row group) simultaneously.
The multirow that multirow stimulates other modification of notion to comprise based on phase place or frequency stimulates.In above example, can utilize waveform to stimulate different row, the effect of the feasible given row of can in the sense waveform of assembling, emanating out with polarity (phase place) difference.It is to stimulate each row in one group with the stimulus waveform with different frequency that another kind shown in Figure 11 allows the mode of such segregation.One or more demodulator circuit then can be with these frequency separations in the sense waveform, and feasible each bar of can emanating out is stimulated the contribution of line.In many examples, may provide demodulator circuit to be used for noise filtering.
Can understand the basis example of other possibility of the stimulus waveform of the principle of explanation here with reference to Figure 12.Timing signal 1201 can limit the stimulation time window.Each bar line can have corresponding timing signal.In the stimulation time window, for example, when signal 1201 was high level, stimulus waveform can be applied on the corresponding line.This stimulus waveform can be taked various forms, comprises square wave, sine wave, index attenuation sine ripple, pulsed sine wave etc.
The used herein stimulation simultaneously means that at least one stimulation is applied on two lines at least in the identical period (window that for example, can comprise one or more pulse of arbitrary shape and combination in any).In other words, stimulate simultaneously and relate at least two and have the line of partly overlapping at least stimulation window in time.For example, in Figure 12 B, the stimulation window of the capable A that limits by timing signal 1201a and the stimulation window of the capable B that is limited by timing signal 1201b can begin simultaneously, continue identical duration and finish simultaneously.Scheme as an alternative, shown in Figure 12 C, the stimulation window (1201a limits by timing signal) of row A and the stimulation window (1201b limits by timing signal) of capable B can begin in the different time and finish, but have some laps at least.Another replacement scheme shown in Figure 12 D is that the stimulation window (1201b limits by timing signal) of the stimulation window (1201a limits by timing signal) of row A and row B can begin simultaneously, but finishes in the different time.Another replacement scheme shown in Figure 12 E is that the stimulation window (1201b limits by timing signal) of the stimulation window (1201a limits by timing signal) of row A and row B can begin in the different time but finish in the identical time.The various configurations here also can expand to the line number more than two row fully neatly, as long as exist some stimulations overlapping between at least some row.
Here Shuo Ming principle can be used to be designed for the input equipment of various electronic equipments and computer system.These electronic equipments and computer system can be any in the polytype shown in Figure 10, comprise desk-top computer 1001, notebook 1002, flat computer 1003, handheld computer 1004, personal digital assistant 1005, media player 1006 and mobile phone 1007 etc.In addition, electronic equipment and computer system can be the combinations of these types, for example are the equipment as the combination of personal digital assistant, media player and mobile phone.
Other change, displacement and the combination of the foregoing description also are possible.For example, can the periodic waveform that touch object from hand or other stimulate and reflection come the infrared/optical sensing apparatus of senses touch and/or suspension incident based on depending on, design multiple point touching and near system.Though with reference to capacitor system principle has been described at this, these principles can be applied to touch or depend on from any system of the information of periodicity stimulus waveform extraction near sensing with being equal to.Therefore following claim should be interpreted as comprising all changes, displacement, combination and the equivalent of the description of preamble.
Claims (17)
1. sensing apparatus simultaneously is characterized in that this while sensing apparatus comprises:
In in the touch sensitive surface with a plurality of sensing points, each sensing points and many drive wires one and many sense wires one is relevant;
Driving circuit, it is configured to simultaneously two in described many drive wires or more drive wires apply drive signal, and wherein unique drive signal is applied on each bar in described two or more the drive wires;
Sensing circuit, it is configured to:
Detect the sensing signal at least one sense wire, this sensing signal touches by one or more object or is correlated with drive signal near one or more sensing points relevant with this sense wire; And
Draw the touch information of described one or more sensing points from this sensing signal.
2. while sensing apparatus according to claim 1, wherein, sensing circuit comprises at least one microcontroller.
3. while sensing apparatus according to claim 2, wherein, described at least one microcontroller is a special IC.
4. while sensing apparatus according to claim 2, wherein, described at least one microcontroller is a digital signal processor.
5. while sensing apparatus according to claim 1, wherein, touch sensitive surface is based on mutual capacitance.
6. while sensing apparatus according to claim 5, wherein, touch information comprises the array of the touch value at each sensing points place.
7. while sensing apparatus according to claim 6, wherein, the touch value is corresponding with the capacitance measurements at each sensing points place.
8. while sensing apparatus according to claim 1, wherein, because predetermined phase relation, the drive signal that is applied on each drive wire is unique.
9. while sensing apparatus according to claim 8, wherein, this predetermined phase relation is selected as eliminating the DC component of sensing signal.
10. while sensing apparatus according to claim 1, wherein, because predetermined frequency relation, the drive signal that is applied on each drive wire is unique.
11. while sensing apparatus according to claim 10, wherein, the drive signal that is applied on each drive wire has unique frequency.
12. while sensing apparatus according to claim 1, wherein, touch sensitive surface is the part of touch-screen.
13. while sensing apparatus according to claim 1, wherein, described at least one sense wire is a drive wire.
14. an electronic equipment, its with according in the claim 1,8 and 10 each the time sensing apparatus as input equipment.
15. electronic equipment according to claim 14, wherein, this electronic equipment is selected from the group that comprises desk-top computer, flat computer and notebook.
16. electronic equipment according to claim 14, wherein, this electronic equipment comprises at least one in handheld computer, personal digital assistant, media player and the mobile phone.
17. a mobile phone, its with according in the claim 1,8 and 10 each the time sensing apparatus as input equipment.
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CN2011101934344A Active CN102226883B (en) | 2007-01-03 | 2007-12-21 | Touch sensing device, method, electronic device including touch sensing device |
CNU2008200062648U Expired - Lifetime CN201293982Y (en) | 2007-01-03 | 2008-01-03 | Simultaneous sensing device, and electronic equipment and mobile telephone applying the simultaneous sensing device |
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CN2011101934344A Active CN102226883B (en) | 2007-01-03 | 2007-12-21 | Touch sensing device, method, electronic device including touch sensing device |
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